红外与激光工程, 2016, 45 (4): 0406002, 网络出版: 2016-05-11   

激光多普勒测速仪的频域自适应阈值检测

Frequency domain adaptive threshold detection for laser Doppler velocimety
作者单位
北京航空航天大学 仪器科学与光电工程学院, 北京 100191
摘要
激光多普勒测速仪(LDV)能够实现载体速度的高精度测量, 从而满足航空航天领域对高精度导航的需求。目标速度测量是建立在回波信号成功检测的基础上进行的, 因此微弱多普勒信号检测是LDV的关键技术。根据光频段噪声频谱特性, 提出了对有用信号频率进行带阻滤波、利用剩余噪声强度估计总体噪声强度的方法, 设计了频域内基于噪声强度估计的自适应阈值信号检测算法。通过与传统的固定阈值算法的对比仿真和实验, 表明该方法具有更好的探测性能, 能够在保持较低恒定虚警概率条件下实现对高于信噪比为-9 dB信号的完全检测, 具有抵抗噪声强度的起伏变化、算法简单、适用性强等特点。
Abstract
Laser Doppler Velocimetry(LDV) is able to measure the velocity of vehicle accurately for high precision navigation in the area of aerospace. The key of the measurement is to detect the Doppler signal successfully, so weak Doppler signal detection is one of the most important technologies due to the presence of noise. An adaptive signal detection algorithm in frequency domain was proposed. Noise was leached from useful signal by band stop filter and the adaptive threshold could be obtained according to the statistical properties of the left noise. Comparisons of simulation and experiments with the fixed threshold algorithm were taken, and the results show that the frequency domain adaptive threshold detection is an effective method to improve the performance of LDV. Under the condition of keeping the low Constant False Alarm Rate (CFAR), the Doppler signal can be completely detected when the Signal-to-Noise Ratio(SNR) is higher than -9 dB, and it is insensitive to the intense of noise, simple and applicable in many area.

聂延举, 孟照魁, 胡姝玲, 范哲, 李军. 激光多普勒测速仪的频域自适应阈值检测[J]. 红外与激光工程, 2016, 45(4): 0406002. Nie Yanju, Meng Zhaokui, Hu Shuling, Fan Zhe, Li Jun. Frequency domain adaptive threshold detection for laser Doppler velocimety[J]. Infrared and Laser Engineering, 2016, 45(4): 0406002.

本文已被 4 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!